【Docker】Docker-Compose构建分布式环境_docker模拟出分布式环境

目标

使用Docker-Compose在Linux环境上构建具备以下中间件：

1. Nacos2.2
2. MySql8
3. redis
4. elasticsearch
5. zookeeper
6. kafka

实现步骤

安装docker

具体安装步骤参考：Install Docker Engine | Docker Docs

获取Nacos docker环境

git clone https://github.com/nacos-group/nacos-docker.git
cd nacos-docker

修改standalone-mysql-8.yaml

version: "3.8"
services:
  nacos:
    image: nacos/nacos-server:${NACOS_VERSION}
    container_name: nacos-standalone-mysql
    env_file:
      - ../env/nacos-standlone-mysql.env
    volumes:
      - ./standalone-logs/:/home/nacos/logs
    ports:
      - "8848:8848"
      - "9848:9848"
    depends_on:
      mysql:
        condition: service_healthy
    restart: always
  mysql:
    container_name: mysql
    build:
      context: .
      dockerfile: ./image/mysql/8/Dockerfile
    image: example/mysql:8.0.30
    env_file:
      - ../env/mysql.env
    volumes:
      - /root/nacos-docker/example/conf.d:/etc/mysql/conf.d
      - ./mysql:/var/lib/mysql
    ports:
      - "3306:3306"
    healthcheck:
      test: [ "CMD", "mysqladmin" ,"ping", "-h", "localhost" ]
      interval: 5s
      timeout: 10s
      retries: 10
  redis:
     image: redis:latest
     restart: "no"
     container_name: redis
     ports:
       - "6379:6379"
     volumes:
       - /root/docker-compose-service/redis/redis.conf:/etc/redis/redis.conf 
       - /root/docker-compose-service/redis/data:/data      
     command: redis-server /etc/redis/redis.conf 
     privileged: true
  elasticsearch:
    image: elasticsearch:7.17.1
    ports:
      - "9200:9200"
      - "9300:9300"
    container_name: "elasticsearch"
    environment:
      # 单节点     
      - "discovery.type=single-node" #以单一节点模式启动
      - "ES_JAVA_OPTS=-Xms512M -Xmx1G" #设置使用jvm内存大小
    volumes:
       - /var/run/docker.sock:/var/run/docker.sock
  zookeeper:
    image: wurstmeister/zookeeper
    restart: always
    ports:
      - 2181:2181
  kafka:
    image: wurstmeister/kafka
    restart: always
    depends_on:
      - zookeeper
    ports:
      - 9092:9092
    environment:
        KAFKA_ADVERTISED_HOST_NAME: kafka
        KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181/kafka
        KAFKA_LISTENERS: PLAINTEXT://:9092
        KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://127.0.0.1:9092
        KAFKA_BROKER_ID: 1
        KAFKA_CFG_LISTENER_SECURITY_PROTOCOL_MAP: INTERNAL:PLAINTEXT,EXTERNAL:PLAINTEXT
    volumes:
        - /var/run/docker.sock:/var/run/docker.sock

设置mysql配置文件

通过挂载配置文件目录实现对mysql的配置,在conf.d目录下创建一个my.cnf文件。

docker部署mysql8

/root/nacos-docker/example/conf.d/my.cnf

my.cnf文件如下，添加了最大连接数和设置了sql_mode:

# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/8.0/en/server-configuration-defaults.html
 
[mysqld]
#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
#
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
 
# Remove leading # to revert to previous value for default_authentication_plugin,
# this will increase compatibility with older clients. For background, see:
# https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html#sysvar_default_authentication_plugin
# default-authentication-plugin=mysql_native_password
skip-host-cache
skip-name-resolve
datadir=/var/lib/mysql
socket=/var/run/mysqld/mysqld.sock
secure-file-priv=/var/lib/mysql-files
user=mysql
max_connections=100000
sql_mode=STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
pid-file=/var/run/mysqld/mysqld.pid
[client]
socket=/var/run/mysqld/mysqld.sock
 
!includedir /etc/mysql/conf.d/

默认mysql密码

通过下列配置文件可以查看到mysql默认的用户名和密码：

mysql环境变量

mysql.env

mysql.env配置了root用户的密码以及nacos所用到的数据库及用户名和密码。

MYSQL_ROOT_PASSWORD=root
MYSQL_DATABASE=nacos_devtest
MYSQL_USER=nacos
MYSQL_PASSWORD=nacos
LANG=C.UTF-8

设置redis配置文件

通过挂载目录的方式实现redis配置。

docker部署redis

/root/docker-compose-service/redis/

redis配置文件仅仅设置了一个密码：

 requirepass abc123

es创建索引

在机器上执行下面命令即可创建索引。

curl -XPUT "localhost:9200/user_1" -H 'Content-Type: application/json' -d'
{
    "settings": {
        "number_of_shards": 3,
        "number_of_replicas": 2
    },
    "mappings": {
        "properties": {
            "id": {
                "type": "long"
            },
            "createdAt": {
                "type": "date",
                "format": "yyyy-MM-dd HH:mm:ss.SSS||yyyy-MM-dd HH:mm:ss"
            },
            "updatedAt": {
                "type": "date",
                "format": "yyyy-MM-dd HH:mm:ss.SSS||yyyy-MM-dd HH:mm:ss"
            }
        }
    }
}
'

启动服务

通过以下命令启动服务：

docker-compose -f ./nacos-docker/example/standalone-mysql-8.yaml up -d

docker ps -a

关闭服务：

docker-compose -f ./nacos-docker/example/standalone-mysql-8.yaml down